It (TEK) is a lot better build. You can debate about PAR meters and such till the cows come home (and I'd be interested in seeing it, too), but in the end, it is a better light and has superior output.
I own TEKs, I own a Catalina. TEK reflectors have several bends around each bulb, Catalinas do not - think of the difference between an AHsupply reflector vs. a coralife reflector, but around each T5 bulb. If you believe that AHsupply reflectors make a difference, then you should apply the same sort of thinking to a Catalina vs. TEK comparison, as well.
Catalina hoods are also not a solid section, so it could potentially become a bit interesting hanging it pendant style - you'd be depending on the end caps of the fixture to hold it all together withstanding force from the opposite direction of what it is built for on the housing itself. It (the casing) is a 3 piece mold that gets fit together and secured in place with the end caps.
This is not meant to construe I am unhappy with my Catalina. It does its job, and is adequate light for my 75g.
I didn't go in to the transaction wanting an equivalent to a TEK; and while a better fixture than many mainstream commercial ones IMHO, the Catalina isn't a TEK equivalent and shouldn't be looked at as such.
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